What is Friction?
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Objective
I can explain how friction affects the motion of objects.
Part 1 of 4
Warm-up video
CrashCourse · 10:59Vetted channel
We don't generate video — this one is by CrashCourse on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
Kinetic friction slows objects as they slide, while static friction must be overcome to start an object's movement.
- 2
The force of kinetic friction depends on the coefficient of kinetic friction between two surfaces and the normal force pressing them together.
- 3
To solve friction problems on a ramp, create a free-body diagram, separate forces into x and y components, and use Newton's second law to calculate acceleration.
Part 3 of 4
Practice
7 questions
Explain the difference between kinetic and static friction, providing an example of each from the video.
What two factors primarily affect the strength of kinetic friction? Write the equation that relates these factors to kinetic friction.
Part 4 of 4
Exit ticket
Quick comprehension check
“Explain how the coefficient of kinetic friction and the normal force affect the force of kinetic friction on a sliding object. Provide the equation that relates these quantities.”
Sample answer included in the free materials
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Teacher Guide
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